Solve: 11.2 × 101 - Decimal Multiplication Challenge

Decimal Multiplication with Large Numbers

11.2×101= 11.2\times101=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Multiply each digit by each digit, and place in the appropriate position
00:09 Any number multiplied by 1 always equals itself
00:16 Any number multiplied by 0 always equals 0
00:26 Any number multiplied by 1 always equals itself
00:34 Add the results
00:42 Sum up all digits after the decimal point
00:48 Based on this sum, we'll place the decimal point
00:52 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

11.2×101= 11.2\times101=

2

Step-by-step solution

To solve this problem, we'll use the distributive property of multiplication:

  • Step 1: Decompose 101 101 into 100+1 100 + 1 .
  • Step 2: Apply the distributive property: 11.2×(100+1)=(11.2×100)+(11.2×1) 11.2 \times (100 + 1) = (11.2 \times 100) + (11.2 \times 1) .
  • Step 3: Calculate 11.2×100 11.2 \times 100 and 11.2×1 11.2 \times 1 , then add the results.

Now, let's execute each step:
Step 1: Write 101 101 as 100+1 100 + 1 .
Step 2: Use the distributive property:
11.2×101=11.2×(100+1)=(11.2×100)+(11.2×1) 11.2 \times 101 = 11.2 \times (100 + 1) = (11.2 \times 100) + (11.2 \times 1) .

Step 3: Perform each multiplication:
11.2×100=1120 11.2 \times 100 = 1120 .
11.2×1=11.2 11.2 \times 1 = 11.2 .

Adding the results: 1120+11.2=1131.2 1120 + 11.2 = 1131.2 .

Thus, the product of 11.2×101 11.2 \times 101 is 1131.2 1131.2 , which matches the correct choice from the provided list.

3

Final Answer

1131.2 1131.2

Key Points to Remember

Essential concepts to master this topic
  • Distributive Property: Break down 101 as 100 + 1 for easier calculation
  • Technique: Calculate 11.2 × 100 = 1120, then 11.2 × 1 = 11.2
  • Check: Add results: 1120 + 11.2 = 1131.2 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to maintain decimal placement when multiplying by powers of 10
    Don't calculate 11.2 × 100 as 112 instead of 1120! This happens when you forget that multiplying by 100 moves the decimal point two places right. Always count decimal places carefully: 11.2 × 100 = 1120.

Practice Quiz

Test your knowledge with interactive questions

\( \text{0}.07\times10= \)

FAQ

Everything you need to know about this question

Why break down 101 instead of just multiplying directly?

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Breaking down 101 into 100 + 1 makes the calculation much easier! Multiplying by 100 just moves the decimal point, and multiplying by 1 keeps the number the same. This avoids complex long multiplication.

How do I multiply a decimal by 100 quickly?

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When multiplying by 100, simply move the decimal point 2 places to the right. So 11.2×100=1120 11.2 \times 100 = 1120 . No complex calculation needed!

What if I get confused about where to place the decimal in my final answer?

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Count the total decimal places in both numbers you're multiplying. 11.2 has 1 decimal place, and 101 has 0, so your answer should have 1 decimal place: 1131.2

Can I use this method for other numbers ending in 01?

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Absolutely! Any number like 201, 301, or 1001 can be broken down this way. For example: 201=200+1 201 = 200 + 1 or 1001=1000+1 1001 = 1000 + 1 .

Is there a faster way than using distributive property?

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You could multiply directly using long multiplication, but the distributive property is often faster and less error-prone for numbers ending in 01, especially with decimals.

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